"JSW" wrote in message
...
Hi
I want to be able to connect smoke alarms to my existing house alarm. At
my
local alarm shop they sell a small pcb which replaces the 9v PP3 battery
and
allows the smoke alarm to be connected to the main alarm. This pcb
probably
has a voltage regulator on it (12v to 9v) and some sort of current sensing
to trigger the main alarm when the smoke alarm sounds.
What I want is to be able to make this pcb myself as the shop wanted to
much
for it and a want a few of them, does anybody know a circuit for such a
thing?

Cheers
John



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conditions occur during a fire! Do you realy want to take that chance that
you may get it all right!!!! Buying a proven unit gives peace of mind!